Chapter 11. Boot Modes and Bootloader
Functions
This chapter explains about the boot modes on the Armadillo and also about the boot configuration functions of Her-
mit-At, the default bootloader.
JP1 can be used to select between the on-board flash memory boot mode and the UART boot mode on Armadillo-440.
In the on-board flash memory boot mode, the bootloader stored in the bootloader region of flash memory is booted. The
UART boot mode is used for system restore when, for example, the bootloader stored in flash memory has been dam-
aged. For more information, refer to "Restoring Bootloader to Factory State" in the "Armadillo-400 Series Software
Manual."
11.1. Boot Mode Selection
Table 11.1. Boot Mode
Mode
JP2
Description
Auto-boot
Open
The Linux kernel is automatically booted after power on.
Maintenance
Short
The Hermit-At command prompt that can be used for changing configuration is started.
11.2. Linux Kernel Boot Option Configuration
Various settings including console and root filesystem settings can be changed by specifying the appropriate Linux kernel
boot options. The following details some options typically used with Armadillo.
The setenv function of Hermit-At is used for this configuration. Parameters set with setenv are saved to flash memory
and remain in effect even after rebooting.
The clearenv command is used to clear any set parameters.
hermit> clearenv
Figure 11.1. Linux Kernel Boot Option Clear
Hermit-AT Modes
Hermit-AT has two modes: the "interactive mode" which displays the command
prompt and operates interactively, and the "batch mode" for communicating with
the Hermit-AT downloader. The command prompt and entered characters are not
displayed in batch mode, but commands can be executed.
Hermit-AT is always in interactive mode after booting. To move from interactive
mode to batch mode enter a tilde "~" and to move from batch mode to interactive
mode enter an exclamation mark "!".
Armadillo-440 LCD Model Development Set Startup Guide
Boot Modes and Bootloader Functions
63
